Visualization of the radiofrequency lesion after pulmonary vein isolation using delayed enhancement magnetic resonance imaging fused with magnetic resonance angiography

Abstract

DE-MRI fused with MRA was superior to DE-MRI for visualization of the RF lesion owing to the precise information on LA and PV anatomy provided by DE-MRI.

Lesion distribution after cryoballoon ablation and hotballoon ablation: Late‐gadolinium enhancement magnetic resonance imaging analysis

“…All patients underwent contrast‐enhanced MRI using a 1.5‐T MR system (Achieva; Philips Medical, Best, The Netherlands) equipped with a 5‐channel cardiac coil 1 to 3 months after the AF ablation. This scan technique has been established, and the acquired images were used for the AF ablation procedure . First, contrast‐enhancement magnetic resonance angiography (CE‐MRA) of the PV‐LA anatomy was acquired with a breath‐hold 3D fast field echo (FFE) sequence in the coronal plane during the first pass of a contrast agent (gadobutrol, Gadovist; Bayer Yakuhin, Osaka, Japan) injection at a dose of 0.1 mmol/kg .…”

“…Finally, a 3D reconstruction of the color‐coded LGE and volume‐rendered LA and PV image generated from the CE‐MRA were fused semiautomatically. An ablation lesion was defined as an artificial LGE site with a signal intensity of more than 2 SD around the PV . The PV ostium was defined as the point of maximal inflection between the PV wall and the LA wall.…”

“…This scan technique has been established, and the acquired images were used for the AF ablation procedure. 9 First, contrast-enhancement magnetic resonance angiography (CE-MRA) of the PV-LA anatomy was acquired with a breath-hold 3D fast field echo (FFE) sequence in the coronal plane during the first pass of a contrast agent (gadobutrol, Gadovist; Bayer Yakuhin, Osaka, Japan) injection at a dose of 0.1 mmol/kg. 10 The purpose of the scanning in the coronal plane is to reduce the number of acquisition slices and shorten the breath-holding time.…”

The lesion characteristics assessed by LGE‐MRI after the cryoballoon ablation and conventional radiofrequency ablation

“…All patients underwent contrast‐enhanced MR imaging using a 1.5‐T MR system (Achieva, Philips Medical, Best, The Netherlands) equipped with a 5‐channel cardiac coil 1–3 months after the AF ablation. This scan technique has been established, and acquired images have been used for the AF ablation procedure . First, contrast enhancement–magnetic resonance angiography (CE‐MRA) of the PV–LA anatomy was acquired with a breath‐hold 3D fast field echo (FFE) sequence in the coronal plane during the first pass of a contrast agent (gadobutrol, Gadovist; Bayer Yakuhin, Osaka, Japan) injection at a dose of 0.1 mmol/kg .…”

“…Finally, a 3D reconstruction, the color‐coded LGE, and volume‐rendered LA and PV image generated from CE‐MRA were fused semi‐automatically. According to the previous study, an ablation lesion was defined as an artificial LGE site with a signal intensity of >2SD around the PV …”